▶ Influent & Effluent Parameters

▶ SBR Tank & Hydraulic Configuration

Tank Volume:

m³

Water Level / Depth:

m

Freeboard: Safety distance from water level to top of tank. Target: 0.3-0.5 m.

m

Total Tank Depth:

m

Tank Shape: Square Rectangular Circular

Length:Width Ratio:

Calculated Surface Area:

m²

Calculated Tank Side:

m

▶ Biological & Aeration Parameters

Sludge Retention Time (SRT): Avg. time biomass is in the system. Target: 3-5 days for BOD removal, 12-20 days for nitrification.

days

Wastewater Temperature (T):

°C

Heterotrophic Yield (Yh): Gross biomass yield before decay. Target: 0.4-0.5 kg VSS/kg bCOD.

kg VSS/kg bCOD

Endogenous Decay (kd): Rate of biomass self-consumption. Target: 0.04-0.075 1/day at 20°C.

1/day @ 20°C

Alpha (α) Factor: O₂ transfer correction for contaminants. Target: 0.8-0.95 for municipal WW.

Beta (β) Factor: O₂ saturation correction for solids. Target: 0.9-0.98.

Diffuser Type: Fine Bubble Coarse Bubble Operating DO (C_L):

mg/L

▶ Chemical Phosphorus Removal

Coagulant Type: Ferric Chloride (FeCl₃) Alum (Al₂(SO₄)₃·14H₂O) Ferric Sulfate (Fe₂(SO₄)₃) Molar Ratio (Coagulant:P): Safety factor for chemical dose. Target: 1.2-2.0 mol/mol. 1.5 is a safe start.

mol/mol

Calculate & Verify Design